1. Division of Pharmaceutical Chemistry; Department of Pharmacy; National and Kapodistrian University of Athens; Athens Greece
2. Molecular Virology Laboratory; Hellenic Pasteur Institute; Athens Greece
3. Department of Infectious Diseases; Molecular Virology; University of Heidelberg; Heidelberg Germany
4. German Center for Infection Research; Heidelberg University; Heidelberg Germany
5. Division of Virus-Associated Carcinogenesis; German Cancer Research Center (DKFZ); Heidelberg Germany